The way that you would normally watch something that is already recording is to go into the list of your recordings and select it there. I think you get an option to either "view" or "start over" when it is recording. If you choose "view" it should let you start viewing the recording at the current "live tv" point, for lack of a better phrase.
This part is pure speculation so don't quote me:
Sounds like the DVR is just not smart enough to distinguish a change back to the same channel from a change to a different channel. Any change just stops the recording.
This part is pure speculation so don't quote me:
Sounds like the DVR is just not smart enough to distinguish a change back to the same channel from a change to a different channel. Any change just stops the recording.